Daewoo DQ-K2121N-P, Service Manual

Page 1: ...is Manual some parts can be changed for improving their performance without notice in the parts list So if you need the latest parts information please refer to PPL Parts Price List in Service Informa...

Page 2: ...AM DQ K2121N D P 25 FBT CRT SCJE ATOC DIAGRAM DQ K2121N D P 26 LOGIC SCHEMATIC DIAGRAM DQ K2121N D P 27 JACK AUDIO SW SCHEMATIC DIAGRAM DQ K2121N D P 28 MULTIPLEXER SCHEMATIC DIAGRAM DQ K2121N D P 29...

Page 3: ...crophone jacks earphone jacks etc isgreater than values given in table 1 below 2 Dielectric strengthen test Confirm specified dielectric strengthen between power cord plug prongs and exposed accessibl...

Page 4: ...voltmeter to measure across both terminals of load Z See figure2 and following table 3 SAFETY PRECAUTIONS This table is unofficial and for reference only Be sure to confirm the precise values for your...

Page 5: ...rm Time 01 02 03 60Sec Off First condition 03Sec Date Time Yes or No First condition Yes Title Yes or No First condition Yes Tape Mode Yes or No First condition Yes Alarm Counter Yes or No First condi...

Page 6: ...35th Power Loss Time Memory 7 Default Load No Yes First condition No FEATURE NTSC SYSTEM REMARK PIXELS 14 20 720x480 PIXELS REAL TIME QUAD PICTURE DISPLAY YES PIP PICTURE IN PICTURE YES note4 2X ZOOM...

Page 7: ...ning Time Reset Press the POWER TIMER Key during 3secs simultaneously In case of No tape status Buzzer Setting Yes MENU SET Language Setting NTSC System No Error Display Clear with the TIMER Knob OSD...

Page 8: ...ecording System Yes MENU SET Series Recording System No REC Check Yes Slow screen for 5secs Daily Programming Yes Sunday Saturday daily REC Weekly Programming Yes Program Setting Yes MENU SET TIMER ME...

Page 9: ...JECT SW only 27 REW SW LED RED 12 PAUSE STILL SW LED RED 28 PLAY SW LED RED 13 LED REPEAT REC LED RED 29 FF SW LED RED 14 REC PLAY SPEED SW only 30 REC PLAY SPEED SW only 15 REC REC CHECK SW LED RED 3...

Page 10: ...CH1 CH4 rca type 3 WARNING OUT 4 COM VIDEO IN CH1 CH4 bnc type 5 TAPE END 6 COM 6 PIN MINI DIN FOR SVC SPEC 7 ALARM OUT 8 COM DC 12V OUTPUT AUDIO OUTPUT 9 ALARM1 IN 10 COM AUDIO INPUT VIDEO INPUT 11 A...

Page 11: ...conds 8 15H 07 C2 4 Press the POWER OFF key 9 15H 08 TIMER to release SVC MODE 10 15H 09 C3 11 15H 0D STOP 12 15H 0E PLAY 13 15H 0F FF 14 15H 10 REW 15 15H 11 PAUSE STILL 16 15H 12 REC 17 15H 13 AUTO...

Page 12: ...h adjust P2 P3 P2 P3 VH SW RF 2 P G ADJUSTMENT S11 Playback the test tape DN 2 7KHz Enter the service mode and select service adjustment S11 Push the REC KEY once P G Adjustement is Automatically Conn...

Page 13: ...input and output impedance requirement 1 video intput Negative sync 1Vp p standard composite video signal 75 2 Video output Same as above 3 Audio input Line 8 8dBm 47K Min 4 Audio output 6dBm 10K Max...

Page 14: ...onnection Method Adjustment Procedure 1 Play back the test tape 2 Set the oscilloscope in the chop mode connect the CH1 to SW pulse P502 3PIN the CH2 to TJ396 video out with CH1 triggering 3 Adjust R5...

Page 15: ...ment of white balance 1 Call up the SVC Mode 2 Adjust with ALARM AUDIO SEL ALARM G BIAS B BIAS keys so that only G B bars in the high beam on the instrument 3 Adjust with GOTO CLEAR REC PLAY UP DOWN G...

Page 16: ...n in C4 3 Press C1 C2 V SLOPE or V SLOPE key and V LINEAR OSD will be displayed 4 Referring to the upper side and lower side adjust with C1 C2 V SLOPE V SLOPE keys so that RETMA pattern may be symmetr...

Page 17: ...r through PJ301 1 2 REC MODE Video signal inputted from monitor will be recorded on the tape through head after FM modulated in IC 1 3 PB MODE FM signal pick uped through drum head from tape output to...

Page 18: ...ie it means high band compensation in order to match AUDIO HEAD characteristic Each mode s peaking frequency will be determined by BIAS element R L C of REC AMP OSC oscillation frequency is 70KHz sine...

Page 19: ...ON 3 SYSTEM PART 3 1 System Block DIAGRAM CRT DY COIL Terminal Jack PART FBT High Volt price AV PART DECK K MECH K 30 VCR Servo Syscon OSC PART Monitor u com IC Multiplexer Part Front KEY Matrix Power...

Page 20: ...COM controls capstan motor C I LIMIT with capstan motor FG numbers DRUM HEAD ON OFF controlled by HEAD AMP SW REC mute signal L R L R L R L R L R L R L 16 65ms 18H EP RECORDING 20FIELD SEC 2H 6H 60FI...

Page 21: ...APE END OUT When the recording tape ends during recording end sensor will be detected This port is used Alarm to outsider until release the end sensor detecting WARNING OUTPUT This port is used to inf...

Page 22: ...21 CIRCUIT OPERATION X RAY PROTECTION CIRCUIT DQ K2121N P...

Page 23: ...22 CIRCUIT INFORMATION 1 CONNECTION DIAGRAM DQ K2121N D P...

Page 24: ...23 CIRCUIT INFORMATION 2 POWER SCHEMATIC DIAGRAM DQ K2121N D P...

Page 25: ...24 CIRCUIT INFORMATION 3 RECODER A V SCHEMATIC DIAGRAM DQ K2121N D P...

Page 26: ...25 CIRCUIT INFORMATION 4 SERVO SYSCON SCHEMATIC DIAGRAM DQ K2121N D P...

Page 27: ...26 CIRCUIT INFORMATION 5 FBT CRT SCHEMATIC DIAGRAM DQ K2121N D P...

Page 28: ...27 CIRCUIT INFORMATION 6 LOGIC SCHEMATIC DIAGRAM DQ K2121N D P...

Page 29: ...28 CIRCUIT INFORMATION 7 JACK AUDIO SW SCHEMATIC DIAGRAM DQ K2121N D P...

Page 30: ...29 CIRCUIT INFORMATION 8 MULTIPLEXER SCHEMATIC DIAGRAM DQ K2121N D P...

Page 31: ...30 CIRCUIT INFORMATION 9 MONITOR A V SCHEMATIC DIAGRAM DQ K2121N D P...

Page 32: ...k Q303 NO Is the video signal from pin29 of IC301 YES Check PCB PATTERN Check Q 303 Check power NO Is on off 5Vsupplied at pin55 58 of IC301 YES Check power1 NO Is the A V CLK DATA signal obtained fro...

Page 33: ...YES Is ON OFF 5V supplied to IC301 at 5V Check ON OFF 5V NO Is the color signal from pin72 fed to pin71 of IC301 Check IC 301 NO Is the luminance signal from pin21 of IC301 fed to pin20 of IC301 Check...

Page 34: ...s the luminance signal from pin 18 fed to pin17 of IC 301 Is 5V supplied at pin 87 of IC 401 NO YES Check 5V of IC 301 NO Is the A V CLK DATA signal obtained from pin23 24 of IC301 YES Check IC 501 NO...

Page 35: ...color signal from pin72 fed to pin71 of IC 301 Is the signal obtained from pin 51 of IC 301 Check IC 401 NO YES Check IC301 NO Is color Rotary pulse supply to pin10 of IC 301 YES Check IC 501 NO Is ON...

Page 36: ...the path of Deck YES NO NO NO YES YES Adjust tracking Noise appears although change cassette tape YES Is CTL pulse output at pin 2 of P502 Playback picture is not good YES NO Check IC501 The voltage o...

Page 37: ...creen on the whole Noise appears on the screen at the bottom Change Drum Ass y Is Enve waveform supplied to pin 4 of P502 Check connector and Head dust NO NO YES Check pattern Check video circuit Chec...

Page 38: ...ESHOOTING FLOW CHART C Auto stop during playback NO Is reel pulse applied to pin 79 and 80 of IC501 Check reel sensor NO YES Is D FG applied to pin 89 of IC501 YES Check IC501 Check connector and D FG...

Page 39: ...ING FLOW CHART D Drum M T loading stops NO NO Is motor 12V supplied from IC 503 Check circuit adjacent EVER 12 4V Check power module NO YES YES Is 5 2V supplied from P506 pin 5 Check IC808 Check conne...

Page 40: ...nd motor Capstan M T loading stops NO YES Is motor 12V supplied Check IC808 NO Is the input of pin 6 of P505 Check circuit of C547 R548 R531 R547 R551 C548 YES NO Is pin 4 of P505 2 5V Check R549 R552...

Page 41: ...s C sync applied to pin 93 of IC501 Check C sync of video IC and pattern Check motor YES Emergency mode when plugging power cord NO YES Is ever 5V applied Check IC810 NO Does X501 crystal oscillate Ch...

Page 42: ...RT H Cassette is not inserted NO YES YES YES NO Is motor 12V supplied Check power Module NO NO CAM DATA is changed when CST IN Check connector Check IC501 Check Deck part Is 5V supplied at pin 31 of I...

Page 43: ...tion does not operate NO YES YES YES When mains is unplugged is 3 6V at pin 37 of IC501 Check C586 C501 C515 C516 NO Is sine signal applied to pin 38 and 39 of IC501 Check X501 NO Is 5V at pin 37 of I...

Page 44: ...TING OF PB MODE YES Check monitor PART No sound in the playback mode NO NO YES Is signal input pin 5 of IC 301 Is AUDIO ON key set to ON Check PJ 201 Check C223 C203 Set AUDIO ON key to ON YES NO Is s...

Page 45: ...No sound in the playback mode after recording NO NO Is signal input pin 78 of IC301 Is AUDIO ON key set to ON Check monitor PART Set AUDIO ON key to ON YES NO Is the voltage above 4V at REC H Check SE...

Page 46: ...ound in the EE modes NO YES Is 12V applied to pin 16 of IC 943 IC942 Check IC806 IC807 NO Is signal input pin 78 of IC 301 Check Audio switch part YES NO Is signal output pin 96 of IC 301 Check IC 301...

Page 47: ...ord and power switch YES NO DC 150V at the side of C805 Check D801 D802 D803 D804 R802 YES NO Oscillater Signal at the pin3 of IC803 Check IC801 YES Check the 2nd stage YES NO DC133V at the pin1 of IC...

Page 48: ...802 and Pin42 of IC401 YES NO B HEAT Signal at the PIN2 3 of PJ804 Check T803 NO Check IC805 IC401 YES Vertical signal and Drive signal at the pin6 7 of P807 YES NO R G B Signal at the pin 42 43 44 of...

Page 49: ...een wrong NO Video Input signal at pin 3 5 7 9 of P001 Check video switch part YES NO VIDEO Signal at the pin30 of IC000 Check IC 010 P003 YES NO VIDEO Signal at the pin6 of IC012 Check IC011 NO Check...

Page 50: ...l at the pin30 of IC007 Check IC 010 P003 YES NO VIDEO Signal at the pin3 of IC012 Check IC011 NO Check the pattern YES VIDEO Signal at the pin50 of IC501 YES NO Check IC501 VIDEO Signal at the pin52...

Page 51: ...MUX IC 21 Vin 3 IN VRT Analog Video Input Not used 22 Vin 4 IN VRT Analog Video Input Not used 23 TEST IN GNDs It enables factory test modes Normal operation it must be connected to GND 24 H OUT OUT X...

Page 52: ...io Signal Input AC Coupling If the register is set up by 0 this pin is usable by Normal input port Not used 51 AIN1 IN GNDs Analog Audio Signal Input AC Coupling If the register is set up by 0 this pi...

Page 53: ...TROL IC WRITE ENABLE SIGNAL OUTPUT 24 MSCB IN OUT MUC IC CONTROL IC ENABLE SIGNAL OUTPUT 25 S D3 IN OUT DECORDER ENCORDER IIC DATA LINE 3 26 OSD DATA 7 IN OUT MUC IC CONTROL PARALELL SIGNAL OUTPUT 7 2...

Page 54: ...N OUT MUTE CONTROL SIGNAL OUTPUT 74 REC SAFETY IN OUT RECORD ENABLE SIGNAL INPUT 75 BUZZER SIG IN OUT BUZZER CONTROL SIGNAL OUTPUT 76 DRUM PWM IN OUT DRUM SPEED CONTROL SIGNAL OUTPUT 77 CAP PWM IN OUT...

Page 55: ...54 COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW...

Page 56: ...55 COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW...

Page 57: ...56 COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW...

Page 58: ...57 COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW...

Page 59: ...58 DISASSEMBLY...

Page 60: ...REMARK AL03 2291050305 FLUXLIQUID RF 800KN AL04 2291050306 FLUXTHINNER RF 800ADD AL05 2291140501 WAXCOVER AL31 2TM1456000 TAPEMASKING SI 602 AL31A 2TM110620R TAPEMASKING SI 600NRED AL31B 2TM1106200 TA...

Page 61: ...7R0 047MFK1608 C055 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 C056 HCFH104ZBA CCHIPCERA 25VY5V0 1MFZ1608 LOC PART CODE PART NAME PART DESC REMARK C057 HCBK473KBA CCHIPCERA 50VX7R0 047MFK1608 C058 HCBK473K...

Page 62: ...1608 C311 CEXF1H339A CELECTRO 50VRSM3 3MF4X7 C312 HCQK201JBA CCHIPCERA 50VCH200PFJ1608 LOC PART CODE PART NAME PART DESC REMARK C314 HCQK101JBA CCHIPCERA 50VCH100PFJ1608 C315 CEXF1C470A CELECTRO 16VRS...

Page 63: ...PCERA 50VCH100PFJ1608 C469 CEXF1C101A CELECTRO 16VRSM100MF 6 3X7 TP C470 HCBK103KBA CCHIPCERA 50VX7R0 01MFK1608 LOC PART CODE PART NAME PART DESC REMARK C475 CEXF1C470A CELECTRO 16VRSM47MF 5X7 TP C476...

Page 64: ...103M CCERASEMI 16VY5S0 01MFM AXIAL C835 CEYF1C222V CELECTRO 16VRSS2200MF 13X25 C837 CEXF1H479A CELECTRO 50VRSM4 7MF4X7 C838 CEXF1H220V CELECTRO 50VRSS22MF 5X11 TP LOC PART CODE PART NAME PART DESC REM...

Page 65: ...D853 DZN4004 DIODE 1N4004 AUTO D901 DZUZ5R6BSB DIODEZENER UZ 5 6BSB 5 46 5 70V D902 DZUZ5R6BSB DIODEZENER UZ 5 6BSB 5 46 5 70V D903 DZUZ5R6BSB DIODEZENER UZ 5 6BSB 5 46 5 70V D904 DZUZ5R6BSB DIODEZENE...

Page 66: ...CKPIN DPSM 8905W JK907 97P6318300 JACKPIN DPSM 8905W JK908 97P6318300 JACKPIN DPSM 8905W JK909 97P6318340 JACKPIN DPSM 9623WY JK911 97P62A21X6 CONNWAFER 750131 2ST6PDIN JK912 97P62A21X6 CONNWAFER 7501...

Page 67: ...65TINCOATING JP100 85801065GY WIRECOPPER AWG221 0 65TINCOATING JP101 85801065GY WIRECOPPER AWG221 0 65TINCOATING LOC PART CODE PART NAME PART DESC REMARK JP102 85801065GY WIRECOPPER AWG221 0 65TINCOA...

Page 68: ...01065GY WIRECOPPER AWG221 0 65TINCOATING JP213 85801065GY WIRECOPPER AWG221 0 65TINCOATING LOC PART CODE PART NAME PART DESC REMARK JP214 85801065GY WIRECOPPER AWG221 0 65TINCOATING JP215 85801065GY W...

Page 69: ...5TINCOATING JP324 85801065GY WIRECOPPER AWG221 0 65TINCOATING JP325 85801065GY WIRECOPPER AWG221 0 65TINCOATING LOC PART CODE PART NAME PART DESC REMARK JP326 85801065GY WIRECOPPER AWG221 0 65TINCOATI...

Page 70: ...PER 0 6X52MMTAPING JP803 85801060TA WIRECOPPER 0 6X52MMTAPING JP804 85801060TA WIRECOPPER 0 6X52MMTAPING JP805 85801060TA WIRECOPPER 0 6X52MMTAPING LOC PART CODE PART NAME PART DESC REMARK JP806 85801...

Page 71: ...WG221 0 65TINCOATING JP963 85801065GY WIRECOPPER AWG221 0 65TINCOATING JP964 85801065GY WIRECOPPER AWG221 0 65TINCOATING JP965 85801065GY WIRECOPPER AWG221 0 65TINCOATING JP966 85801065GY WIRECOPPER A...

Page 72: ...5 P902 97P62G07DR CONNFFC GF120 25S LS25PR A P902A 97P88F1R35 CABLEFFC 1 25R25P350MM P903 97P6284500 CONNWAFER YFAW025 110ANGLE3 5X4 5 P952 97P62G06DR CONNFFC GF120 25S TS25PST LOC PART CODE PART NAME...

Page 73: ...HRFS472JBA RCHIP 1 16 4 7KOHMJ1608 LOC PART CODE PART NAME PART DESC REMARK R040 HRFS472JBA RCHIP 1 16 4 7KOHMJ1608 R041 HRFS472JBA RCHIP 1 16 4 7KOHMJ1608 R042 HRFS472JBA RCHIP 1 16 4 7KOHMJ1608 R043...

Page 74: ...ILM 1 61 2KOHMJ R439 HRFS271JBA RCHIP 1 16 270OHMJ1608 R440 HRFS222JBA RCHIP 1 16 2 2KOHMJ1608 LOC PART CODE PART NAME PART DESC REMARK R441 HRFS223JBA RCHIP 1 16 22KOHMJ1608 R442 HRFS201JBA RCHIP 1 1...

Page 75: ...1 16 2 7KOHMJ1608 R565 HRFS512JBA RCHIP 1 16 5 1KOHMJ1608 R566 85801060TA WIRECOPPER 0 6X52MMTAPING LOC PART CODE PART NAME PART DESC REMARK R567 RD AZ102J RCARBONFILM 1 61KOHMJ R568 HRFS561JBA RCHIP...

Page 76: ...P 1 16 4 7KOHMJ1608 R916 HRFS103JBA RCHIP 1 16 10KOHMJ1608 R917 RD AZ102J RCARBONFILM 1 61KOHMJ LOC PART CODE PART NAME PART DESC REMARK R918 HRFS472JBA RCHIP 1 16 4 7KOHMJ1608 R919 HRFS472JBA RCHIP 1...

Page 77: ...T CAP SW721 5S50101012 SWTACT JTP1240RHTCGR JTP1240RHT CAP SW722 5S50101012 SWTACT JTP1240RHTCGR JTP1240RHT CAP SW723 5S50101011 SWTACT JTP1240CGR JTP1240 CAP SW724 5S50101011 SWTACT JTP1240CGR JTP124...

Page 78: ...686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA DAEWOO ELECTRONICS Corp...